Interfacial Engineering in PtNiCo/NiCoS Nanowires for Enhanced Electrocatalysis and Electroanalysis.

Interfacial Engineering in PtNiCo/NiCoS Nanowires for Enhanced Electrocatalysis and Electroanalysis. Chemistry. 2019 Nov 26;: Authors: Guo S, Sun Y, Li Y, Qin Y, Wang L Abstract Searching for new anti-poisoning Pt-based catalysts with enhanced activity for alcohol oxidation is the key in direct alcohol fuel cells (DAFCs). However, the traditional strategy for designing bimetallic or multimetallic alloy is still difficult to achieve a satisfactory heterogeneous electrocatalyst because the activity often depends on only the surface atoms. Herein, we fabricated the multi-component active sites by creating a sulfide structure on one-dimensional (1D) PtNiCo trimetallic nanowires (NWs), to obtain PtNiCo/NiCoS interface NWs (IFNWs). Owing to the presence of sulfide interfaces, the PtNiCo/NiCoS IFNWs enable an impressive methanol/ethanol oxidation reaction (MOR/EOR) performance and excellent anti-CO poisoning tolerance. It exhibits MOR and EOR mass activities of 2.25 A mg -1 Pt and 1.62 A mg -1 Pt , around 1.26, 3.21 and 1.46, 2.96 times higher than those of PtNiCo NWs and commercial Pt/C, respectively. CO-stripping and X-ray photoelectron spectroscopy (XPS) measurements further demonstrate that the new interfacial structure and optimal bonding of Pt-CO can result in accelerating the removal of surface adsorbed carbonaceous intermediates through co-operating synergistically. Moreover, such a unique structure has also demonstrated a much-impr...
Source: Chemistry - Category: Chemistry Authors: Tags: Chemistry Source Type: research